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Transverse susceptibility as a probe of the magnetocrystalline anisotropy driven phase transition in Pr_{0.5}Sr_{0.5}CoO_{3}



Natalie F. Huls, N S. Bingham, M. H. Phan, H. Srikanth, D. D. Stauffer, C. Leighton


Half-doped Pr_{1-x}Sr_{x}CoO_{3} (x=0.5) displays anomalous magnetism most notably manifest in the field-cooled magnetization versus temperature curves under different applied cooling fields. Recently, an explanation was put forth that a magnetocrystalline anisotropy transition driven by a structural transition at 120K is the cause of this behavior. In this paper, we further elucidate the nature of the magnetic anisotropy across this low temperature phase transition in this material by means of transverse susceptibility (TS) measurements performed using a self-resonant tunnel diode oscillator. TS scans as a function of field clearly reveal peaks associated with the anisotropy and switching fields. When peak placement is examined as a function of temperature around 120K, the signature of an FM-FM phase transition is evident as a sharp feature in H_{K} and a corresponding cusp in H_{S}. A new TS peak (not yet observed in other classes of magnetic oxides such as manganites and spinel ferrites) is correlated with the crossover field of the unusual M(T) behavior, and we demonstrate how TS peak magnitude can indicate easy axis switching in polycrystalline samples. Our results further confirm that TS can provide new insights into the magnetic behavior of complex oxides.
Physical Review B


Cobaltites, Magnetocrystalline anisotropy, Magnetic switching


Huls, N. , Bingham, N. , Phan, M. , Srikanth, H. , Stauffer, D. and Leighton, C. (2011), Transverse susceptibility as a probe of the magnetocrystalline anisotropy driven phase transition in Pr_{0.5}Sr_{0.5}CoO_{3}, Physical Review B, [online], (Accessed June 23, 2024)


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Created January 19, 2011, Updated February 19, 2017